快速超塑性镁合金制备新方法

发布时间：2018-05-05 14:11

  本文选题：搅拌摩擦工艺 + SiO颗粒　； 参考：《稀有金属》2015年10期

【摘要】：将SiO2颗粒填入AZ61镁合金基体上预先开出的沟槽中,利用搅拌摩擦工艺(FSP)成功地将颗粒均匀地搅拌进镁合金中。利用扫描电镜(SEM)观察了试样搅拌区颗粒分布情况,分别对高温退火和高温拉伸试样的晶粒长大情况进行了观察,测量了试样搅拌区及其附近区域的硬度,利用扫描电镜进行了断口形貌分析并对试样高温变形机制进行了分析。结果表明:大部分SiO2颗粒被均匀地搅拌进镁合金中,仅有少量的颗粒以聚集块形式存在;未掺入SiO2颗粒的搅拌摩擦试样搅拌区平均硬度为HV78,而掺入SiO2颗粒的试样搅拌区平均硬度为HV110,提高了HV30左右;合金中的SiO2颗粒有效地抑制了静态退火、高温拉伸和搅拌摩擦过程中的晶粒长大,使其保持在3μm以内;试样在400℃下以3×10-1s-1的应变速率拉伸得到的伸长率最大,达到了453%,实现了材料高应变速率下的超塑性。
[Abstract]:The SiO2 particles were filled into the pre-opened grooves on the AZ61 magnesium alloy matrix, and the particles were successfully evenly stirred into the magnesium alloy by friction stir technology. The particle distribution in the agitation zone was observed by SEM, and the grain growth in the high temperature annealed and tensile samples at high temperature was observed, and the hardness of the agitated zone and its adjacent region was measured. The fracture morphology was analyzed by SEM and the deformation mechanism at high temperature was analyzed. The results show that most of the SiO2 particles are stirred into magnesium alloy uniformly, and only a few particles exist in the form of aggregates. The average hardness of friction stir zone without SiO2 particles was HV78, while that of SiO2 particles was HV110, which increased HV30, and the SiO2 particles in the alloy effectively inhibited static annealing. During high temperature tension and friction stirring, the grain grows and keeps within 3 渭 m, and the elongation of the sample is the largest at 4 脳 10-1s-1 strain rate at 400 鈩，

本文编号：1847995